content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
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  // modification, are permitted provided that the following conditions are
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  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
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  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
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  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf.util;
  
  import com.google.protobuf.Duration;
  import com.google.protobuf.Timestamp;
  
  import java.math.BigInteger;
  import java.text.ParseException;
  
  /**
   * Utilities to help create/manipulate Timestamp/Duration
   *
   * @deprecated Use {@link Durations} and {@link Timestamps} instead.
   */
  @Deprecated
  public final class TimeUtil {
    // Timestamp for "0001-01-01T00:00:00Z"
    public static final long TIMESTAMP_SECONDS_MIN = -62135596800L;
  
    // Timestamp for "9999-12-31T23:59:59Z"
    public static final long TIMESTAMP_SECONDS_MAX = 253402300799L;
    public static final long DURATION_SECONDS_MIN = -315576000000L;
    public static final long DURATION_SECONDS_MAX = 315576000000L;
  
    private static final long NANOS_PER_SECOND = 1000000000;
  
    private TimeUtil() {}
  
    /**
     * Convert Timestamp to RFC 3339 date string format. The output will always
     * be Z-normalized and uses 3, 6 or 9 fractional digits as required to
     * represent the exact value. Note that Timestamp can only represent time
     * from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59.999999999Z. See
     * https://www.ietf.org/rfc/rfc3339.txt
     *
     * <p>Example of generated format: "1972-01-01T10:00:20.021Z"
     *
     * @return The string representation of the given timestamp.
     * @throws IllegalArgumentException if the given timestamp is not in the
     *         valid range.
     * @deprecated Use {@link Timestamps#toString} instead.
     */
    @Deprecated
    public static String toString(Timestamp timestamp) {
      return Timestamps.toString(timestamp);
    }
  
    /**
     * Parse from RFC 3339 date string to Timestamp. This method accepts all
     * outputs of {@link #toString(Timestamp)} and it also accepts any fractional
     * digits (or none) and any offset as long as they fit into nano-seconds
     * precision.
     *
     * <p>Example of accepted format: "1972-01-01T10:00:20.021-05:00"
     *
     * @return A Timestamp parsed from the string.
     * @throws ParseException if parsing fails.
     * @deprecated Use {@link Timestamps#parse} instead.
     */
    @Deprecated
    public static Timestamp parseTimestamp(String value) throws ParseException {
      return Timestamps.parse(value);
    }
  
    /**
     * Convert Duration to string format. The string format will contains 3, 6,
     * or 9 fractional digits depending on the precision required to represent
     * the exact Duration value. For example: "1s", "1.010s", "1.000000100s",
     * "-3.100s" The range that can be represented by Duration is from
     * -315,576,000,000 to +315,576,000,000 inclusive (in seconds).
     *
     * @return The string representation of the given duration.
     * @throws IllegalArgumentException if the given duration is not in the valid
     *         range.
     * @deprecated Use {@link Durations#toString} instead.
     */
    @Deprecated
    public static String toString(Duration duration) {
      return Durations.toString(duration);
    }
  
    /**
     * Parse from a string to produce a duration.
     *
     * @return A Duration parsed from the string.
     * @throws ParseException if parsing fails.
     * @deprecated Use {@link Durations#parse} instead.
     */
    @Deprecated
    public static Duration parseDuration(String value) throws ParseException {
      return Durations.parse(value);
    }
  
    /**
     * Create a Timestamp from the number of milliseconds elapsed from the epoch.
     *
     * @deprecated Use {@link Timestamps#fromMillis} instead.
     */
    @Deprecated
    public static Timestamp createTimestampFromMillis(long milliseconds) {
      return Timestamps.fromMillis(milliseconds);
    }
  
    /**
     * Create a Duration from the number of milliseconds.
     *
     * @deprecated Use {@link Durations#fromMillis} instead.
     */
    @Deprecated
    public static Duration createDurationFromMillis(long milliseconds) {
      return Durations.fromMillis(milliseconds);
    }
  
    /**
     * Convert a Timestamp to the number of milliseconds elapsed from the epoch.
     *
     * <p>The result will be rounded down to the nearest millisecond. E.g., if the
     * timestamp represents "1969-12-31T23:59:59.999999999Z", it will be rounded
     * to -1 millisecond.
     *
     * @deprecated Use {@link Timestamps#toMillis} instead.
     */
    @Deprecated
    public static long toMillis(Timestamp timestamp) {
      return Timestamps.toMillis(timestamp);
    }
  
    /**
     * Convert a Duration to the number of milliseconds.The result will be
     * rounded towards 0 to the nearest millisecond. E.g., if the duration
     * represents -1 nanosecond, it will be rounded to 0.
     *
     * @deprecated Use {@link Durations#toMillis} instead.
     */
    @Deprecated
    public static long toMillis(Duration duration) {
      return Durations.toMillis(duration);
    }
  
    /**
     * Create a Timestamp from the number of microseconds elapsed from the epoch.
     *
     * @deprecated Use {@link Timestamps#fromMicros} instead.
     */
    @Deprecated
    public static Timestamp createTimestampFromMicros(long microseconds) {
      return Timestamps.fromMicros(microseconds);
    }
  
    /**
     * Create a Duration from the number of microseconds.
     *
     * @deprecated Use {@link Durations#fromMicros} instead.
     */
    @Deprecated
    public static Duration createDurationFromMicros(long microseconds) {
      return Durations.fromMicros(microseconds);
    }
  
    /**
     * Convert a Timestamp to the number of microseconds elapsed from the epoch.
     *
     * <p>The result will be rounded down to the nearest microsecond. E.g., if the
     * timestamp represents "1969-12-31T23:59:59.999999999Z", it will be rounded
     * to -1 millisecond.
     *
     * @deprecated Use {@link Timestamps#toMicros} instead.
     */
    @Deprecated
    public static long toMicros(Timestamp timestamp) {
      return Timestamps.toMicros(timestamp);
    }
  
    /**
     * Convert a Duration to the number of microseconds.The result will be
     * rounded towards 0 to the nearest microseconds. E.g., if the duration
     * represents -1 nanosecond, it will be rounded to 0.
     *
     * @deprecated Use {@link Durations#toMicros} instead.
     */
    @Deprecated
    public static long toMicros(Duration duration) {
      return Durations.toMicros(duration);
    }
  
    /**
     * Create a Timestamp from the number of nanoseconds elapsed from the epoch.
     *
     * @deprecated Use {@link Timestamps#fromNanos} instead.
     */
    @Deprecated
    public static Timestamp createTimestampFromNanos(long nanoseconds) {
      return Timestamps.fromNanos(nanoseconds);
    }
  
    /**
     * Create a Duration from the number of nanoseconds.
     *
     * @deprecated Use {@link Durations#fromNanos} instead.
     */
    @Deprecated
    public static Duration createDurationFromNanos(long nanoseconds) {
      return Durations.fromNanos(nanoseconds);
    }
  
    /**
     * Convert a Timestamp to the number of nanoseconds elapsed from the epoch.
     *
     * @deprecated Use {@link Timestamps#toNanos} instead.
     */
    @Deprecated
    public static long toNanos(Timestamp timestamp) {
      return Timestamps.toNanos(timestamp);
    }
  
    /**
     * Convert a Duration to the number of nanoseconds.
     *
     * @deprecated Use {@link Durations#toNanos} instead.
     */
    @Deprecated
    public static long toNanos(Duration duration) {
      return Durations.toNanos(duration);
    }
  
    /**
     * Get the current time.
     *
     * @deprecated Use {@code Timestamps.fromMillis(System.currentTimeMillis())} instead.
     */
    @Deprecated
    public static Timestamp getCurrentTime() {
      return Timestamps.fromMillis(System.currentTimeMillis());
    }
  
    /**
     * Get the epoch.
     *
     * @deprecated Use {@code Timestamps.fromMillis(0)} instead.
     */
    @Deprecated
    public static Timestamp getEpoch() {
      return Timestamp.getDefaultInstance();
    }
  
    /**
     * Calculate the difference between two timestamps.
     *
     * @deprecated Use {@link Timestamps#between} instead.
     */
    @Deprecated
    public static Duration distance(Timestamp from, Timestamp to) {
      return Timestamps.between(from, to);
    }
  
    /**
     * Add a duration to a timestamp.
     *
     * @deprecated Use {@link Timestamps#add} instead.
     */
    @Deprecated
    public static Timestamp add(Timestamp start, Duration length) {
      return Timestamps.add(start, length);
    }
  
    /**
     * Subtract a duration from a timestamp.
     *
     * @deprecated Use {@link Timestamps#subtract} instead.
     */
    @Deprecated
    public static Timestamp subtract(Timestamp start, Duration length) {
      return Timestamps.subtract(start, length);
    }
  
    /**
     * Add two durations.
     *
     * @deprecated Use {@link Durations#add} instead.
     */
    @Deprecated
    public static Duration add(Duration d1, Duration d2) {
      return Durations.add(d1, d2);
    }
  
    /**
     * Subtract a duration from another.
     *
     * @deprecated Use {@link Durations#subtract} instead.
     */
    @Deprecated
    public static Duration subtract(Duration d1, Duration d2) {
      return Durations.subtract(d1, d2);
    }
  
    // Multiplications and divisions.
  
    // TODO(kak): Delete this.
    public static Duration multiply(Duration duration, double times) {
      double result = duration.getSeconds() * times + duration.getNanos() * times / 1000000000.0;
      if (result < Long.MIN_VALUE || result > Long.MAX_VALUE) {
        throw new IllegalArgumentException("Result is out of valid range.");
      }
      long seconds = (long) result;
      int nanos = (int) ((result - seconds) * 1000000000);
      return normalizedDuration(seconds, nanos);
    }
  
    // TODO(kak): Delete this.
    public static Duration divide(Duration duration, double value) {
      return multiply(duration, 1.0 / value);
    }
  
    // TODO(kak): Delete this.
    public static Duration multiply(Duration duration, long times) {
      return createDurationFromBigInteger(toBigInteger(duration).multiply(toBigInteger(times)));
    }
  
    // TODO(kak): Delete this.
    public static Duration divide(Duration duration, long times) {
      return createDurationFromBigInteger(toBigInteger(duration).divide(toBigInteger(times)));
    }
  
    // TODO(kak): Delete this.
    public static long divide(Duration d1, Duration d2) {
      return toBigInteger(d1).divide(toBigInteger(d2)).longValue();
    }
  
    // TODO(kak): Delete this.
    public static Duration remainder(Duration d1, Duration d2) {
      return createDurationFromBigInteger(toBigInteger(d1).remainder(toBigInteger(d2)));
    }
  
    private static final BigInteger NANOS_PER_SECOND_BIG_INTEGER =
        new BigInteger(String.valueOf(NANOS_PER_SECOND));
  
    private static BigInteger toBigInteger(Duration duration) {
      return toBigInteger(duration.getSeconds())
          .multiply(NANOS_PER_SECOND_BIG_INTEGER)
          .add(toBigInteger(duration.getNanos()));
    }
  
    private static BigInteger toBigInteger(long value) {
      return new BigInteger(String.valueOf(value));
    }
  
    private static Duration createDurationFromBigInteger(BigInteger value) {
      long seconds = value.divide(new BigInteger(String.valueOf(NANOS_PER_SECOND))).longValue();
      int nanos = value.remainder(new BigInteger(String.valueOf(NANOS_PER_SECOND))).intValue();
      return normalizedDuration(seconds, nanos);
    }
  
    private static Duration normalizedDuration(long seconds, int nanos) {
      if (nanos <= -NANOS_PER_SECOND || nanos >= NANOS_PER_SECOND) {
        seconds += nanos / NANOS_PER_SECOND;
        nanos %= NANOS_PER_SECOND;
      }
      if (seconds > 0 && nanos < 0) {
        nanos += NANOS_PER_SECOND;
        seconds -= 1;
      }
      if (seconds < 0 && nanos > 0) {
        nanos -= NANOS_PER_SECOND;
        seconds += 1;
      }
      if (seconds < DURATION_SECONDS_MIN || seconds > DURATION_SECONDS_MAX) {
        throw new IllegalArgumentException("Duration is out of valid range.");
      }
      return Duration.newBuilder().setSeconds(seconds).setNanos(nanos).build();
    }
  }
  